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A group of similar cells & extracellular products that carry out common functions.
The study of tissues & their relationships within organs.
What are the four tissue types in the body?
Tissues are formed from what 3 primary germ layers?
1) Ectoderm ("ecto" = outside/external; "derm" = skin)
What does the EXTRACELLULAR MATRIX, compose of?
Water, protein fibers, and dissolved macromolecules.
What is the EPITHELIAL TISSUE?
Covers or lines every body surface and all body cavities.
Forms internal/external lining of many organs
*NO blood vessels penetrate epithelial cells.
Characteristics of EPITHELIAL TISSUE.
High regeneration capacity
Cellularity: ET is almost all cells.
Polarity: free/top surface, fixed/bottom surfaces.
Attachment: Bound to thin basement membrane.
Avascularity: All EC lack blood vessels (none can penetrate)
Innervation: Environment detection.
Regeneration: frequently damaged but replaced similarly.
Functions of Epithelial Tissue.
Physical protection: ET protect both exposed & internal surfaces from dehydration, abrasion, and destruction.
S. Permeability: All E. cells act as "gatekeepers".
Secretions: secretion through Exocrine glands.
Sensations: Detect changes in the external environment..
Describe the basement membrane, its origins, and its functions.
A thin extracellular layer between the connective tissue & the epithelium.
Functions to form a molecular barrier between the epithelial and connective tissue.
Tissue levels of Organization